A = 133 yards2
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The radius of a circle is equal to half of it's diameter. If you want to figure out the radius from a given diameter, simply divide the diameter by two:Radius = Diameter / 2Radius = 61 / 2Radius = 30.5 yd
C= pi*d 13=pi*d 13/pi=d r=d/2 r=13/(2pi)
Area of a circle = pi*radius2 Area = 15.90431281 square units
Area = Pi(d/2)2 where d = diameter
The equation for the surface area of a circle is Pi times the radius squared. Pi x r^2 = Area of a circle The radius is 1/2 the diameter therefore if d is the diameter; Pi x (d/2)^2 = Area of a circle